Walk through a long a path

[Jay82]

Hi Guys & Gals

X1.4 User.

Trying to use the new walkthrough a long a path tool. Every time I attempt to use this tool I have an information dialog box pop up stating "You must first create and then select a polyline or spline to use as your path to record a walkthrough"
I have followed the help instructions directly how they tell you to do it. Ive used a line to show my path I select all the line segments then go to 3d, walkthrough, record walkthrough along path. Once i do all this the Information dialog box comes up.

I have no problem constructing the walkthough from a 3d view camera although I find that limited.
Has anyone else had this issue or know how to correct my problem. Its probably something very simple although cant seem to figure it out

Thanks

Jay